DECconcentrator 900TH

This document provides a comprehensive guide for the installation, configuration, and maintenance of the DECconcentrator 900TH module. The DECconcentrator 900TH is a 16-port Fiber Distributed Data Interface (FDDI) concentrator designed to operate within a DEChub 900 MultiSwitch or as a standalone unit with a DEChub ONE docking station.

Key features highlighted include hot-swap capabilities, software-configurable front-panel ports supporting Multimode Fiber (MMF), Single-mode Fiber (SMF), and Twisted-pair for FDDI (TP-FDDI) ModPMDs, and an Optical Bypass Relay (OBR). The module integrates Simple Network Management Protocol (SNMP) for network management, supports SMT 7.3 Station Management, and can be managed out-of-band via Serial Line Internet Protocol (SLIP) or through Digital's HUBwatch Network Management Station (NMS). Firmware upgrades are performed using Trivial File Transfer Protocol (TFTP), and the module includes an automatic self-test.

The manual details step-by-step installation procedures, covering power requirements, proper seating of the module, and connecting various port cables. Configuration is performed via a setup port, allowing users to reset settings, view current configurations, configure IP addresses (including SNMP parameters and BootP), access error logs, and perform firmware upgrades. Module-specific options address SNMP port traps, quick PC-trace recovery, and FDDI port configuration, while out-of-band port configuration allows setting port speed and enabling/disabling RTS.

The document also provides procedures for replacing ModPMDs, emphasizing necessary tools and antistatic precautions. Troubleshooting guidance extensively uses LED indicators to diagnose power-up sequences and operational issues, offering probable causes and corrective actions. Loopback testing instructions are included to help isolate port-related problems. Finally, the manual covers various cable descriptions, connector pin assignments, and detailed product specifications for operating environment, power, physical attributes, and certifications. Multiple safety warnings are provided throughout, particularly regarding fiber optic light, static electricity, and power interruptions during firmware updates.